// Problem: 
// Contest: 
// URL: 
// Memory Limit: 
// Time Limit: 
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#include<bits/stdc++.h>
using namespace std;
#define int long long
inline int read(){
	int s=0,w=1;
	char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
	while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
	return s*w;
}
signed main()
{
	srand(time(0));
	int n=100;
	//freopen("live.in","w",stdout);
	//int w=rand()%101;
	//cout<<n<<" "<<w<<endl;
	cout<<n<<endl;
	for(int i=1;i<=n;)
	{
		int a=rand()%10000;
		int b=rand()%10000;
		if(a<b)
		{
			cout<<a<<" "<<b<<endl;
			i++;
		}
		
	}
	return 0;
}
